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-/* Assembler macros for i386.
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- Copyright (C) 1991-93,95,96,98,2002,2003,2005,2006
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- Free Software Foundation, Inc.
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- This file is part of the GNU C Library.
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-
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- The GNU C Library is free software; you can redistribute it and/or
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- modify it under the terms of the GNU Lesser General Public
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- License as published by the Free Software Foundation; either
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- version 2.1 of the License, or (at your option) any later version.
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-
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- The GNU C Library is distributed in the hope that it will be useful,
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- but WITHOUT ANY WARRANTY; without even the implied warranty of
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- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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- Lesser General Public License for more details.
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-
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- You should have received a copy of the GNU Lesser General Public
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- License along with the GNU C Library; if not, write to the Free
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- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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- 02111-1307 USA. */
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-
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-#include <common/sysdep.h>
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-
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-#ifdef __ASSEMBLER__
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-
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-/* Syntactic details of assembler. */
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-
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-/* ELF uses byte-counts for .align, most others use log2 of count of bytes. */
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-#define ALIGNARG(log2) 1<<log2
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-/* For ELF we need the `.type' directive to make shared libs work right. */
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-#define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg;
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-#define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
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-
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-/* In ELF C symbols are asm symbols. */
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-#undef NO_UNDERSCORES
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-#define NO_UNDERSCORES
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-
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-/* Define an entry point visible from C.
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-
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- There is currently a bug in gdb which prevents us from specifying
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- incomplete stabs information. Fake some entries here which specify
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- the current source file. */
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-#define ENTRY(name) \
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- STABS_CURRENT_FILE1("") \
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- STABS_CURRENT_FILE(name) \
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- ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name); \
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- ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function) \
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- .align ALIGNARG(4); \
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- STABS_FUN(name) \
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- C_LABEL(name) \
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- cfi_startproc; \
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- CALL_MCOUNT
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-
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-#undef END
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-#define END(name) \
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- cfi_endproc; \
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- ASM_SIZE_DIRECTIVE(name) \
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- STABS_FUN_END(name)
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-
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-#ifdef HAVE_CPP_ASM_DEBUGINFO
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-/* Disable that goop, because we just pass -g through to the assembler
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- and it generates proper line number information directly. */
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-# define STABS_CURRENT_FILE1(name)
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-# define STABS_CURRENT_FILE(name)
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-# define STABS_FUN(name)
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-# define STABS_FUN_END(name)
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-#else
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-/* Remove the following two lines once the gdb bug is fixed. */
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-#define STABS_CURRENT_FILE(name) \
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- STABS_CURRENT_FILE1 (#name)
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-#define STABS_CURRENT_FILE1(name) \
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- 1: .stabs name,100,0,0,1b;
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-/* Emit stabs definition lines. We use F(0,1) and define t(0,1) as `int',
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- the same way gcc does it. */
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-#define STABS_FUN(name) STABS_FUN2(name, name##:F(0,1))
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-#define STABS_FUN2(name, namestr) \
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- .stabs "int:t(0,1)=r(0,1);-2147483648;2147483647;",128,0,0,0; \
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- .stabs #namestr,36,0,0,name;
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-#define STABS_FUN_END(name) \
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- 1: .stabs "",36,0,0,1b-name;
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-#endif
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-
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-/* If compiled for profiling, call `mcount' at the start of each function. */
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-#ifdef PROF
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-/* The mcount code relies on a normal frame pointer being on the stack
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- to locate our caller, so push one just for its benefit. */
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-#define CALL_MCOUNT \
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- pushl %ebp; cfi_adjust_cfa_offset (4); movl %esp, %ebp; \
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- cfi_def_cfa_register (ebp); call JUMPTARGET(mcount); \
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- popl %ebp; cfi_def_cfa (esp, 4);
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-#else
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-#define CALL_MCOUNT /* Do nothing. */
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-#endif
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-
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-#ifdef NO_UNDERSCORES
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-/* Since C identifiers are not normally prefixed with an underscore
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- on this system, the asm identifier `syscall_error' intrudes on the
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- C name space. Make sure we use an innocuous name. */
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-#define syscall_error __syscall_error
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-#define mcount _mcount
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-#endif
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-
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-#define PSEUDO(name, syscall_name, args) \
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- .globl syscall_error; \
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-lose: SYSCALL_PIC_SETUP \
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- jmp JUMPTARGET(syscall_error); \
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- ENTRY (name) \
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- DO_CALL (syscall_name, args); \
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- jb lose
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-
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-#undef PSEUDO_END
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-#define PSEUDO_END(name) \
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- END (name)
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-
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-#undef JUMPTARGET
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-#ifdef __PIC__
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-#define JUMPTARGET(name) name##@PLT
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-#define SYSCALL_PIC_SETUP \
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- pushl %ebx; \
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- cfi_adjust_cfa_offset (4); \
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- call 0f; \
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-0: popl %ebx; \
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- cfi_adjust_cfa_offset (-4); \
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- addl $_GLOBAL_OFFSET_TABLE+[.-0b], %ebx;
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-
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-
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-# define SETUP_PIC_REG(reg) \
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- .ifndef __x86.get_pc_thunk.reg; \
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- .section .gnu.linkonce.t.__x86.get_pc_thunk.reg,"ax",@progbits; \
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- .globl __x86.get_pc_thunk.reg; \
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- .hidden __x86.get_pc_thunk.reg; \
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- .type __x86.get_pc_thunk.reg,@function; \
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-__x86.get_pc_thunk.reg: \
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- movl (%esp), %e##reg; \
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- ret; \
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- .size __x86.get_pc_thunk.reg, . - __x86.get_pc_thunk.reg; \
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- .previous; \
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- .endif; \
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- call __x86.get_pc_thunk.reg
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-
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-# define LOAD_PIC_REG(reg) \
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- SETUP_PIC_REG(reg); addl $_GLOBAL_OFFSET_TABLE_, %e##reg
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-
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-#else
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-#define JUMPTARGET(name) name
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-#define SYSCALL_PIC_SETUP /* Nothing. */
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-#endif
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-
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-/* Local label name for asm code. */
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-#ifndef L
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-#ifdef HAVE_ELF
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-#define L(name) .L##name
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-#else
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-#define L(name) name
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-#endif
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-#endif
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-
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-#endif /* __ASSEMBLER__ */
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